feat(engineering): add desktop-manager skill for Windows desktop automation

[FreyaFujo]

Summary

• Adds engineering/desktop-manager/ — a new Windows-only skill for full desktop control from Claude Code via PowerShell + Win32 API, requiring no third-party tools or admin elevation
• Three Python CLI scripts (stdlib-only): window_manager.py (list/snap/tile/move/focus), process_manager.py (list/launch/kill), desktop_snapshot.py (save/restore named layouts)
• Win32 API reference in references/powershell-window-api.md covering GetWindowRect, SetWindowPos, ShowWindow, multi-monitor, DPI, virtual desktops

Test plan

• skill_validator.py score: 100/100 (EXCELLENT)
• skill_security_auditor.py --strict: PASS — 0 CRITICAL, 0 HIGH
• script_tester.py: 3/3 PASS — syntax, argparse, stdlib-only, help, JSON output
• python -m compileall engineering/desktop-manager/scripts/: clean
• SKILL.md: 180 lines (under 500-line cap)
• Manual: run python scripts/window_manager.py list on Windows 10/11 to verify window enumeration
• Manual: run python scripts/window_manager.py tile --layout 2col to verify tiling

🤖 Generated with Claude Code

[alirezarezvani]

Thanks for this — the skill is genuinely useful and the SKILL.md is well-structured: clear slash-command table, a good "When this activates" trigger list, a thorough Win32 API reference, and stdlib-only scripts with sensible subcommand design. A few items need to be addressed before it can merge.

Blocking

1. Missing .claude-plugin/plugin.json + no marketplace.json entry.
Every skill package needs its own engineering/desktop-manager/.claude-plugin/plugin.json (name, description, version, author, homepage, repository, license, skills) and a registration entry in the root .claude-plugin/marketplace.json. This is enforced by scripts/check_plugin_json.py --all in CI, so the build will fail without it. Use the canonical ./-prefixed skills form — for a single-skill plugin with SKILL.md at the plugin root: "skills": ["./"].

2. PowerShell injection in process_manager.py → launch_app().
--path and --args are escaped with .replace("'", "\\'"), but PowerShell single-quoted strings do not use backslash escaping — a literal single quote is escaped by doubling it (''). As written, an input containing ' breaks out of the quoted string and the remainder is interpreted as PowerShell. Unlike list/kill (which run names through _sanitize_name), launch --path and --args are passed through with only this broken escape, so this is a real injection vector.

Minimum fix:

target = path.replace("'", "''")     # PowerShell single-quote escaping
safe_args = args.replace("'", "''")

Better: pass arguments as a PowerShell array rather than interpolating a single string, and/or invoke via subprocess arg lists where possible. Please also add a one-line note in the SKILL.md "Requirements"/security section that --path/--args accept arbitrary executables by design (the caller is trusted), so the trust boundary is explicit.

3. Test plan is unverified.
The PR checklist lists skill_validator.py 100/100, skill_security_auditor.py --strict PASS, and script_tester.py 3/3 — but all boxes are unchecked. Please run them and paste the output (the security auditor in particular should be re-run after the escaping fix above). python -m compileall engineering/desktop-manager/scripts/ should be clean too.

Non-blocking (nice to have)

4. Slash commands aren't wired up. SKILL.md documents /desktop:windows, /desktop:tile, etc., but no commands/ files are included. The repo convention is a cs-* agent + /cs:* command per skill (see engineering/caveman, engineering/write-a-skill). Either add them or drop the slash-command table to match what ships.

5. Rebase onto current dev. This branch is based on the ~220-skill era; dev is now well ahead. Please rebase so the marketplace counts and surrounding structure line up and the diff stays clean.

The Windows-only scope is fine (metadata.platform: windows is honest about it). Once items 1–3 are in I'm happy to re-review. Targeting dev is correct 👍

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Reviewed via Claude Code.

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